661422408 has 32 divisors (see below), whose sum is σ = 1725451200. Its totient is φ = 210888128.

The previous prime is 661422407. The next prime is 661422409. The reversal of 661422408 is 804224166.

It is an interprime number because it is at equal distance from previous prime (661422407) and next prime (661422409).

It is not an unprimeable number, because it can be changed into a prime (661422407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 598563 + ... + 599666.

It is an arithmetic number, because the mean of its divisors is an integer number (53920350).

Almost surely, 2^661422408 is an apocalyptic number.

It is an amenable number.

661422408 is an abundant number, since it is smaller than the sum of its proper divisors (1064028792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661422408 is a wasteful number, since it uses less digits than its factorization.

661422408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198261 (or 1198257 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 661422408 is about 25718.1338358754. The cubic root of 661422408 is about 871.2837910303.

The spelling of 661422408 in words is "six hundred sixty-one million, four hundred twenty-two thousand, four hundred eight".